Recessing-tool for lathes.



G. B. MILLER.

RBGBSSING TOOL FOR LATHES. APPLICATION FILED APR.6, 1912.

1 #035,221. Patented Aug. 13,1912.

2 SHEETS-SHEET 14 Fla.- 1

I WITNESSES iNVE NTOR f0 gear qaflflw? \TTORNEY G. MILLER. REGESSING TOOL FOR LATHBS. APYLIGATION TILED APILG, 1912.

Patented Aug. 13, 1912.

2 SHEETS-SHEET 2v INVENTOR WITNESSES #QW I fi'fiolyel lllider I BY Tfi v ATTORNB s srnrns PATENT caries.

GEORGE E. MILLER, OF ETNA, PENNSYLVANIA.

' RECESSING-TOOL FOR LATHES.

Specification of Letters Patent.

Patented Aug. 13, 191.23.

Application filed. April 6, 1912. Serial No. 688,996.

To all whom it may concern:

Be it known that I, GEORGE E. MILLER, a citizen of the United States of America, residing at Etna, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Recessing-Tools for Lathes, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention is an improvement u on.

my Patent No. 605,184 granted June th, 1908 on an improved recessing-tool for lathes.

Besides having the same objects in view as disclosed in my prior patent, the present invention aims to provide a tapping device wherein positive and reliable means are employed, as hereinafter set forth, for quickly retracting the threading and recessing elements of my invention, device can be quickly removed from a piece of work.

My-invention further aims to accomplish the above results by a mechanical construction that is durable, practical and highly efiicient for the purposes for which it is intended.

The mechanical construction of my invention will be hereinafter specifically described and then claimed, and reference will now be had to the drawings, wherein there is illustrated a preferred embodiment of the invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claims.

In the drawings :Figure 1 is a side elevation of the tapping device showing the same in position operating upon a coupling,

Fig. 2 is a similar view, partly broken away illustrating the device in a retracted position for immediate withdrawal from a piece of work, Fig. 3 is a side elevationof a lathe attachment, F 1g. 4 is an end view of the same, nal sectional view of a detached reamer holder, Fig. 6 is an end view of the same, Fig. 7 is a. cross sectional view of a sectional retracting device, Fi 8 is an end view of the same, Fig. .9 is a side elevation of a regulating device, Fig. 10 is an end view of'the same, Fig. 11.is a'nenlarged side elevation of an expander for a threading is an end view of the same, Figs.

and partly in section,

whereby the,

pander to the outer end thereof, ashe Fig. 5 is a longituditool, Fig. 12;

13 and .14- are enlarged perspective views of reamer tools, and Fig. 15 is an enlarged perspective view of a threading tool.

Further describing my invention in defall, like numerals of reference designate. corresponding parts throughout: 1 denotmg a lathe head to which is secured. by screw bolts 2 or other fastening means. a lathe attachment, (see Figs. 3 and at) comprising a circular plate 3 that has openings 4 to receive thescrew bolts 2. The circular plate 3 has a stem 5, the inner end of which is screw threaded, as at 6. The outer end of the stem -5 has a frusto-conical shaped cutter holding head 7 and said head and the stein 5 have a longitudinal bore 8 extending from the outer end of the head into the threaded portion of the stem. The open end of the bore 8 is enlarged, as at 9 to provide an annular seat 10. The stem 5 has a transverse slot 11 that is in communica tion with the inner end of the bore 8.

12 denotes-radially disposed slots in the walls of the head 7, said slots being in com-'- munication with the large end 9 of the bore 8. The slots 12 correspond in length to the head 7 and anouter edge of each slot is beveled or cut away, as at 13 to provide clearance" for shavings.

14 denotes segment shaped sockets in thy outer end of the head 7 and said head has recesses 15 formed therein with the walls of said recesses screw threaded, for a. purpose that will hereinafter appear.

16 denotes a cylindrical expander that is mounted in the large end 9 of the bore 8 upon the seat 10, said expander having a cylindrical shank 17 extending into the inner end of the bore 8.

The shank 17 has a transverse opening 18 to receive a pin 19 that extends through the slots 11. The walls of the expander 16 have inclined grooves 20, the grooves being radially disposed and converging from the inner end of the oxthreading bit ing to the inclination of the grooves 20. the purpose of which will hereinafter appear.

denotes a reamer holder in the form of a sleeve that is placed'upon the stem 5, between the threaded portion 6 thereof and the head 7. One end of the reamer holder 25 has radially disposed arms 26 provided with longitudinal openings 27 and radially disposed openings 28. the latter having the walls thereof screw threaded to receive set screws 29. Arranged in the opening 27 of each arm are reamer tools 30 and 31 that are retained therein by the set screw 29. The reamer tool 31 has a cutting tooth that extends over the tool 30, as best shown in Figs. 1 and 2, the tooth 32 fa ing the end of a coupling 33 or other piece of work while the tool 30 reams the end of the coupling.

34 denotes a head carried by the opposite end of the reamer holder, said head having an annular groove 35 and a radially disposed opening 36 providing clearance for the pin 19. The reamer holder is made in 25 two sections, as bestshown in Fig. 6, whereby the holder can be fitted upon the stem 5, and the sections of said reamer holder are connected by screws 37.

38 denotes a sectional retracting device that is screwed upon the threaded portion 6 of the stem 5, the sections of said device being held together by screws 39. The inner end of the device has a recess 40 to receive the end of the head 34 and an annular rib 41 fitting in the annular groove 35 of the head 34. The retracting device has diametrically opposed handles 42 and when said device is adjusted upon the screw threads 6 by said handles. the reamerholder 25 is shifted longitudinally of the stem 5, also the thr 'ading tool hold'cr 16 by reason of the pin 19 extend ng through the holder 25 and the stem 17. The longitudinal movement of the holders 2:") and 1G relatively to the stem 5 is limited by the ends of the slot 11 in the stem 5.

4 denotes a regulating device in the form of a circular head that is secured to the outer end of the head 7 of the lathe attachment by set screws 44 extending through the openings 45 in the regulating device and into the recess lfrof the head T. The regulating device 43 has the inner end thereof provided with a circular recess -l(' to receive the outer end of the expander. and the outer end of the regulating device ha a boss 47 for a screw 48 that is employed for controlling the outward movement of the expander. The screw 48 has a jam nut 49 for locking said screw in an adjusted position. The inner end of the regulating device has segment-shaped ribs 30 that fitv into the sockets 14 of the head 7. The periphery of the regulating device is notched, as at 51 to provide clearance for shavings, particularly when the tapping device s being operated'in a small coupling.

In operation, the coupling 33 or the piece of work is held and t -d on to the tapping device. whereby the threadinghits 23 will intcriorly screw thread the coupling and ream or recess the end thereof, the threading and recessing ol the coupling being simultaneously accomplished. .\ssuming that the operations have l)("l1 performed, the reaming or threading tools or bits are quickly reliaised relatively to the coupling by adjusting the retracting device. 33 upon the stem .3. .-\s the retracting device is revolved, the reamer holder 25 is shifted away from the coupling 33, as shown in Fig. 2, and simultaneously with the movement'- of the reamer holder the expander is shifted within the head 7 of the lathe attachment. .\s the bits 23 cannot shift longitudinally of the lathe attachment, the bits are retracted by reason of the inclined grooves 20 which allow the bits to rccede from the walls of the piece of work, and the piece of work can be quickly removed from the tapping device. The tapping of a coupling or piece of work can therefore be economically and expeditiously performed, which is a desideratum in connection with small pieces of work.

It is thought that the operation and utility of the tapping device will be apparent without further description, and I would have it understood that other tools than those herein shown and. described can be used for performing various kinds of'lathe work.

What I claim is:-

1. A tapping device comprising a lathe attachment, an expander movable within said attachment, threading bits carried by said expander and shiftable relatively thereto, a reamer holder movable upon said lathe attachment and shiftable simultaneously with said expander, and a retracting device arranged upon said lathe attachment and connected to said expander and reamer holder for simultaneously shifting them.

2. A tapping device comprising a lathe attachment, an expander movable within said attachment, thrcadin bite carried by said expander and shiftab e relatively thereto, a reamer holder movable upon said lathe attachment and shiftable simultaneously with said expanliler. a retracting device arranged upon said lathe attachment and connected to said expander and reamer holder for simultaneously shifting them, and a regulating device connected to said lathe attachment to'regulate the movement of said expander.

3. A tapping device comprising a lathe attachment, an expander shiftably arranged within said attachment, threading bits carried by said expander and extending radially from said lathe attachment. :1 reamer holder arranged pander upon said lathe attachment and -movable simultaneou'sl reainer' tools carrie by said holder,

with said ex:-

a sect onal retractingdevice adjustably 'laflgogattachment 51. the

- and "attachment h pander mova attachment and expander and reamer and includingascrew for mo ement' of said expander and name-enema. 4.? A 2 tapping device com risin a'vinga slott lyarranged within said .Iathe 5 attachment, threading bits movably mounted in said expander and shiftable relativel thereto, a' section a] reamer holder arranged a -iathe hea an exupon said lathe attachment and movable in unison with said expander, reamer tools carried by said reamerholder, a sectional retracting device adjustably mounted upon said lathe attachment and connected thereto and to the expander and holder for retract-. Y

ing said reamer tools and'said bitarelatively to a; piece oiwork, and means carried bythe head of said lathe attachment'and includin a screw for limiting the movementof sai expander and-holder.

In-testimony whereof I afiixmy signature in the presence of two witnesses. 4

' GEORGE MILLER. Witnesses:

-- 'JQP. Armin,

CHRISTINA H0011.-

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